50hp Evinrude rough Idle

[drake]

I have a 74 50hp sizzler,just acquired been sitting for a number of years,OH carbs,new plugs,hoses,lines but still does't want to run at low speed or idle most of the time.<br /><br />What should the compression and float levels be?The compression checks at 85psi even.<br /><br />Also every now and then when cracking the throttle open builds RPMs slowly,have changed props.

 

[ob]

Re: 50hp Evinrude rough Idle

At 85 per cylinder it aint sizzlin as much.You can attempt to tune it out ,however I don't think it's going to run like new.May have to live with a little rough idle .Compression should be 100+.

 

[drake]

Re: 50hp Evinrude rough Idle

Ok I rechecked the compression on the 50 doing it the way I learned on the forum.Didnt have the throttle open before,and the compression now reads at 125 and 130 per cyl.Still the motor at times just wont idle.<br />Any suggestions?<br />Is this just and OMC thing have two others,another 1989 50hp and a 74 115hp johnson and they both take spells where they just wont idle.<br />Thanks, I am new to the forum and already have learned a lot.

 

[ob]

Re: 50hp Evinrude rough Idle

Drake,don't know specifics on float level adj.Most idle and fuel delivery problems are a direct result of motors sitting idle for extended periods and carb ports and orifices becoming restricted rather than any inherent fragility.On a motor of that vintage i would recommend servicing entire fuel system beginning with carb dismanteling and cleaning.Also , fuel lines ,disconnects,prime bulbs,and fuel pump as all of these components when not used regularly are prone to failure and would result in similar performance issues.It is quite simply a process of elimination .Check the most accessible and obvious to start with.